javascript - 语法完美的函数失败 'silently' - 我应该如何调试？

Question

调试静默JS功能失败

<小时/>

我编写了一个 Node 连接函数，该函数连接成功，将数据插入数据库，但随后无法执行处理任何进一步错误的代码。

在这种情况下我应该如何调试？

<小时/>

这是我的相关脚本:

var connection = createConnection();

connection.connect(function (err) {
    if (err) return callback(new Error('Failed to connect'), null);
    console.log('[Post]Connection with the officeball MySQL database opened...');

    connection.query(
        'INSERT INTO `officeball`.`sales_entries` SET category = ?, `group` = ?, date = ?, price = ?, customer = ?, seller = ?, commission = ?',
    salesData),

    function (err, rows, fields) {

        if (err) console.log(err);
        connection.destroy();
        console.log('[Post]...Connection with the officeball MySQL database closed.');

    }
});

这是我的控制台输出:

Application initializing...
Application successfully initialized!
Server running at http://127.0.0.1:8080/
User username1 is attempting to validate for a hit...
Connection with the Officeball MySQL database openned...
...Connection with the Officeball MySQL database closed.
User username1 validated and is ready!
[Post] Connection with the officeball MySQL database opened...

<小时/>

注意:您会注意到日志中存在两个连接，其中第一个连接成功打开和关闭。这就是验证。第二个连接未关闭，是由上述脚本启动的连接。

由于日志清楚地显示没有 fatal error ，因此您可以假设此处的所有内容都已正确定义。这是我到现在为止还没有遇到过的问题。通常，如果函数失败，程序就会结束并导致非常具体的错误。

Answer 1

正如 Aaron 所说，删除“salesData”后面的“)”并将其添加到“}”后面第 8 行。如果您打算将 RDB 与 Node 一起使用，请检查 https://github.com/luciotato/waitfor或https://github.com/luciotato/LiteScript

var connection = createConnection();

connection.connect(function (err) {
    if (err) return callback(new Error('Failed to connect'), null);
    console.log('[Post]Connection with the officeball MySQL database opened...');

    connection.query(
        'INSERT INTO `officeball`.`sales_entries` SET category = ?, `group` = ?, date = ?, price = ?, customer = ?, seller = ?, commission = ?',
    salesData, function (err, rows, fields) {

        if (err) console.log(err);
        connection.destroy();
        console.log('[Post]...Connection with the officeball MySQL database closed.');

    });
});

另请阅读亚伦的第二条评论:

I strongly suggest installing and running jshint. For the snippet you posted here, it complains: "line 17, col 5, Expected an assignment or function call and instead saw an expression." which is the anonymous function that never gets passed anywhere. – Aaron Dufour